As the population ageing, more and more patients suffer from joint disease in Taiwan. Joint replacement surgery performedin Taiwan is about 10,000 to 20,000 cases yearly. The purpose of this study was to investigate the Quality of life and jointfunctions of TKR ( total knee replacement ) and THR ( total hip replacement) patients 6 weeks and 3 months after surgery. Convenience sampling was used and a total 126patients were recruited. Average age was 72.75 ( SD = 9.046). THR surgery was 21( 16.7 % ) and TKR surgery was 105 ( 83.3 % ).One hundred and twenty patients ( 95.2 % ) lived with family and six ( 4.8 % ) was lived alone. Mean score of perceived theconvenience of home environment was 3.90 ( SD = .74 ) , with 18.7% of patients felt a little inconvenience or veryinconvenience, 81.7% felt convenience or very convenience. The patients had moderate satisfaction about the surgery,with mean score 17.68 ( SD = 2. 13 ) 6 weeks and 17.75( SD = 2.55 ) 3 months after surgery. There was significant differencebetween TKR patients and THR patients on pre-operation ( t = 3.225 , p utility index. Repeated measures ANOVA was used to analyze TKR patients on joint function ( F = 61.38 , p = .000 ) andperceived health score ( F = 3.74 , p ANOVA was used to analyze THR patients on joint function and perceived health score on pre-operation, 6 weeks and 3months after surgery, it showed no significant difference ( p > .05 ). Because of small sample size of THR patients, it Mayaffect the results of inference. It is recommended to keep track of longer surgical outcomes, and increase the number ofTHR patients, to improve the results of inferential.